Line 170 is an enigma : (var) value, // Place holder for the value function. As (var) value = f() is defined later on @line 230... does 170 really make

Message 2 of 4
, Mar 27, 2008

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Line 170 is an enigma :

(var) value, // Place holder for the value function.

As (var) value = f() is defined later on @line 230... does 170 really
make any difference ?

If it does, why ? how ? I can't figure it out.

Please let me know : I'm "worried" about line 170 :-)

Also, I wonder why did you "feel the need" to rewrite the parser
without RegExps ?
This one should run (much?) slower, I mean, vs the native speed of
RegExps, or not ?
Why/when would you choose one version over the other ?

>
> Line 170 is an enigma :
>
> (var) value, // Place holder for the value function.
>
> As (var) value = f() is defined later on @line 230... does 170 really
> make any difference ?

As a matter of discipline, I always declare things before I use them.

> Also, I wonder why did you "feel the need" to rewrite the parser
> without RegExps ?

Some people are distrustful of regular expressions. An implementation
that does not use regular expressions may be more easily ported to
other languages.

Tatu Saloranta

On Thu, Mar 27, 2008 at 1:56 AM, Jorge Chamorro wrote: ... You may well be right that a regexp based one is faster (given JS lack of

Message 4 of 4
, Mar 27, 2008

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On Thu, Mar 27, 2008 at 1:56 AM, Jorge Chamorro <jorge@...> wrote:
...
> Also, I wonder why did you "feel the need" to rewrite the parser
> without RegExps ?
> This one should run (much?) slower, I mean, vs the native speed of
> RegExps, or not ?
> Why/when would you choose one version over the other ?

You may well be right that a regexp based one is faster (given JS'
lack of efficient string/char manipulation methods), but performance
is one area where intuition often leads astray. One should not try to
guess which is faster, but to measure.
So it would be great to get a performance test to verify which is
faster (and on which JS engines) and by how much.

-+ Tatu +-

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